Well, well... I have been trying to find out whether there is clear advice on this or whether there is conflicting information which may be at the root of it. It appears to be the latter.
The credencial states "at least one sello per day" and that is what the Pilgrims' Office works on.
However there is a Cathedral Website which states:
"Your papers will have to be stamped at least twice per day"
Just to add to the confusion the same site also says:
"One must request a recommendation letter in the parish, in the docese, in the brotherhood etc. in which is accredited as a pilgrim. This letter can be used as a credencial...."
It goes on to say that you can also use the "offical" credencial. The Pilgrims' Office clearly states that that the Credencial IS the letter of recommendation
And in another paragraph it says that "if you have not got the letter or the credencial you can use a route journal to collect the stamps and dates." (paraphrased)
On the CSJ website the following information is posted.
In 2002 the Pilgrim Office in Santiago started asking pilgrims to get two stamps per day in their credenciales or Pilgrim Records. We asked for confirmation and clarification of this new request, and here is their reply:
"Last year we started to control a little bit more the credentials and the stamps, in order to differenciate pilgrims on foot, horse or by bicycle from those who are using other means of transport to come to Santiago. The Cathedral of Saint James wants to be fair with those who are doing the pilgrimage by giving them, and only them, the "Compostela". That is the reason why we ask for two stamps per day. However, we understand that if a pilgrim starts the Way in a far away point, it is enough to get only one stamp. Otherwise, they would need several credentials. We specially apply the rule of the two stamps per day to pilgrims starting from Galicia. We really appreciate your interest on the matter, and will be very grateful if you would give that piece of information to the pilgrims addressing the Confraternity."
So, be prepared, if you're starting from anywhere west of say Ponferrada (or picking up a pilgrimage made in stages), to get two stamps a day, and get hold of another credencial if you need room for the extra stamps. However, if you've come from outside Galicia, one stamp a day within Galicia is still enough. (This advice was confirmed by the Pilgrim Office in June 2006.)
So there is conflicting advice which is probably the source of the rumours to which you refer and maybe it is no wonder that there is confusion about the border of Galicia the last 100 kms and so on!
I'll be in the Office again later in July and then for all of August and some time in September. I'll suggest that we get the various website people together to agree that everyone gives the same information.
But of course we need less rules not more!
Best wishes
John